| 1 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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| 2 | !! THIS INFORMATION IS OUTDATED WITH REGARD TO THE ECOMSTATION ADAPTED !!
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| 3 | !! VERSIONS OF AIR-BOOT ! (Versions v1.07 and higher) !!
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| 4 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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| 5 |
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| 6 |
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| 7 |
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| 8 | ÖÄ[ Developer Information for AiR-BOOT v1.05+ ]ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ·
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| 9 | ÖÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ ÄÄ ú ú ÄÄ ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ·
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| 10 | º º
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| 11 | º This documentation is meant for developers that wish to support AiR-BOOT. º
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| 12 | º It explains detection, verification and reading/changing configuration of º
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| 13 | º AiR-BOOT. º
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| 14 | º º
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| 15 | ÓÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ ÄÄ ú ú ÄÄ ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄœ
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| 16 | ÓÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄœ
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| 17 |
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| 18 | 1.1 - Foreword
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| 19 | 2.1 - Detection
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| 20 | 2.2 - Code-Image
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| 21 | 2.3 - Config-Data
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| 22 | 3.1 - Configuration
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| 23 | 3.2 - Internal Partition Table
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| 24 | 3.3 - Hide-Configuration
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| 25 |
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| 26 | -------------------------------------------------------------------------------
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| 27 |
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| 28 | ===================
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| 29 | | 1.1 - FOREWORD |
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| 30 | ===================
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| 31 |
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| 32 | This document defines several aspects of AiR-BOOT v0.26b+ and is
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| 33 | currently on the level of AiR-BOOT v1.05+.
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| 34 |
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| 35 | AiR-BOOT is an advanced multi-boot-loader that resides completly in
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| 36 | MBR/track-0. It has built-in colored menu-driven setup,
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| 37 | Virus-Detection and much more.
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| 38 |
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| 39 | Please keep in mind that you are responsible for doing those changes
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| 40 | the documented, correct manner. AiR-BOOT is able to fix some
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| 41 | configuration values like Default-Partition, because the user could
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| 42 | have killed that partition as well, but AiR-BOOT is not completely
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| 43 | error-tolerant. Work as defined in this documentation and everything
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| 44 | will work as expected.
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| 45 |
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| 46 | All offsets are zero-based, which means offset 1 is the 2nd byte.
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| 47 | Everything is meant to be in Intel-Order.
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| 48 |
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| 49 | AiR-BOOT and its source is available via
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| 50 | http://air-boot.sourceforge.net
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| 51 |
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| 52 | You may contact the author via
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| 53 | m_kiewitz [AT] users [DOT] sourceforge [DOT] net
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| 54 |
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| 55 |
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| 56 | ====================
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| 57 | | 2.1 - DETECTION |
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| 58 | ====================
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| 59 |
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| 60 | AiR-BOOT consists of several parts.
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| 61 | - AiR-BOOT MBR Code (sector 1)
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| 62 | - AiR-BOOT Code (starting at sector 2)
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| 63 | - AiR-BOOT configuration (sector 55-59)
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| 64 | - AiR-BOOT MBR backup (sector 60)
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| 65 |
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| 66 | A detailed view:
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| 67 |
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| 68 | Sec. Name
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| 69 | ---------------------------
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| 70 | | 1 | Master Boot Record | -> Code
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| 71 | | 2 | System-Table | -> Code
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| 72 | | 3 | Code | -> Code
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| 73 | | .. | ... | -> Code
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| 74 | | 55 | Configuration | -> Config
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| 75 | | 56 | Partitiontable 1 | -> Config
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| 76 | | 57 | Partitiontable 2 | -> Config
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| 77 | | 58 | Hide-Configuration | -> Config
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| 78 | | 59 | Hide-Configuration | -> Config
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| 79 | | 60 | Backup of our MBR | -> Config
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| 80 | ---------------------------
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| 81 |
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| 82 | Internally those parts are combined into Code and Configuration Data.
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| 83 | Both can get individually checked for corruption, so if the code is
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| 84 | damaged, but the configuration is intact, we don't have to rewrite
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| 85 | everything and force the user to reconfigure.
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| 86 |
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| 87 | Now a basic-routine used for making a checksum out of ONE 512-byte
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| 88 | sector. Further use is explained in the following sections.
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| 89 |
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| 90 | ; In: BX - Base Check
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| 91 | ; DS:SI - Pointer to 512-byte-area to be included
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| 92 | ; Out: BX - Base Check Result
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| 93 | ; Destroyed: SI will get updated (+512)
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| 94 | MBR_GetCheckOfSector Proc Near Uses ax cx
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| 95 | mov cx, 256
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| 96 | GetCheckOfSector_Loop:
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| 97 | lodsw
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| 98 | xor ax, 0BABEh
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| 99 | xor bx, ax
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| 100 | loop GetCheckOfSector_Loop
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| 101 | or bx, bx
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| 102 | jnz GetCheckOfSector_NoFixUp
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| 103 | mov bx, 1 ; No 0, because 0 means "empty"
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| 104 | GetCheckOfSector_NoFixUp:
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| 105 | ret
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| 106 | MBR_GetCheckOfSector EndP
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| 107 |
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| 108 |
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| 109 | =====================
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| 110 | | 2.2 - CODE-IMAGE |
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| 111 | =====================
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| 112 |
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| 113 | Detecting presence of AiR-BOOT code is easy.
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| 114 | Look in the MBR at offset 2 for the signature 'AiRBOOT'.
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| 115 |
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| 116 | If it's found, then the following structure is legal:
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| 117 |
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| 118 | -----------------------------------------------------------------------
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| 119 | Contents: Standard AiR-BOOT basic information structure
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| 120 | =======================================================================
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| 121 | Identifier : STRING * 7 - 'AiRBOOT'
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| 122 | DayOfRelease : BYTE - in BCD
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| 123 | MonthOfRelease : BYTE - in BCD
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| 124 | YearOfRelease : WORD - in BCD (non-intel byte order)
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| 125 | MajorVersion : BYTE - in BCD
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| 126 | MinorVersion : BYTE - in BCD
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| 127 | ReleaseLanguage : BYTE - 'D' for dutch
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| 128 | 'F' for french
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| 129 | 'G' for german
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| 130 | 'I' for italian
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| 131 | 'R' for russian
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| 132 | 'E' for english (v1.01+)
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| 133 | 'S' for swedish
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| 134 | 'U' for USA (removed in v1.01+)
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| 135 | TotalCodeSectors : BYTE - counting from sector 2
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| 136 | CheckSumOfCode : WORD - explained later
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| 137 | -----------------------------------------------------------------------
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| 138 |
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| 139 | Now how to verify, if the Code-Image is completely intact.
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| 140 |
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| 141 | Please note: There is no verification of the MBR-code. Anyway, if the
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| 142 | MBR-code is bad, then the signature should not be in place and it
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| 143 | would not load anyway.
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| 144 |
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| 145 | Code used for verification in x86 assembly:
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| 146 |
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| 147 | ; DS:SI - point to Sector 2 (the sector following MBR)
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| 148 | xor bx, bx
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| 149 | mov cx, TotalCodeSectors
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| 150 | CheckCodeLoop:
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| 151 | call MBR_GetCheckOfSector
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| 152 | loop CheckCodeLoop
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| 153 | -> BX holds CheckSum
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| 154 |
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| 155 | Now if BX and CheckSumOfCode match, we got a intact code-image.
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| 156 |
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| 157 |
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| 158 | ======================
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| 159 | | 2.3 - CONFIG-DATA |
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| 160 | ======================
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| 161 |
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| 162 | Detecting AiR-BOOT configuration is similar to code detection.
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| 163 | Look in sector 55 at offset 0 for the signature 'AiRCFG-TABLE'.
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| 164 |
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| 165 | If it's found, then the following structure is legal:
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| 166 |
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| 167 | -----------------------------------------------------------------------
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| 168 | Contents: Standard AiR-BOOT config identification structure
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| 169 | =======================================================================
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| 170 | Identifier : STRING * 13 - 'AiRCFG-TABLE'
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| 171 | MajorVersion : BYTE - in BCD
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| 172 | MinorVersion : BYTE - in BCD
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| 173 | ReleaseLanguage : BYTE - see above
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| 174 | EditCounter : DWORD - Will be increased on every save
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| 175 | CheckSumOfConfig : WORD - explained later
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| 176 | -----------------------------------------------------------------------
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| 177 |
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| 178 | Please note: MajorVersion/MinorVersion/ReleaseLanguage may NOT have to
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| 179 | match the Version in the basic information structure.
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| 180 | This is the version of AiR-BOOT that installed the Config
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| 181 | area. It may be as well the current data structure level.
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| 182 | Anyway, you need to get the code version to find out what
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| 183 | data structure is used.
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| 184 |
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| 185 | Code used for verification in x86 assembly:
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| 186 |
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| 187 | ; DS:SI - point to Sector 55
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| 188 | xor bx, bx
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| 189 | mov cx, 5 ; total of 5 configuration sectors
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| 190 | CheckCodeLoop:
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| 191 | call MBR_GetCheckOfSector
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| 192 | loop CheckCodeLoop
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| 193 | -> BX holds CheckSum
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| 194 |
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| 195 | Now if BX and CheckSumOfConfig match, we got an intact code-image.
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| 196 |
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| 197 | Please note: The MBR-BackUp sector is *NOT* included.
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| 198 |
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| 199 |
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| 200 | ========================
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| 201 | | 3.1 - CONFIGURATION |
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| 202 | ========================
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| 203 |
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| 204 | Please note: You have to check that the configuration data is INTACT,
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| 205 | before even thinking about writing to the configuration
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| 206 | area. If it's not intact, consider it as unknown data.
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| 207 |
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| 208 | After changing anything in configuration area, do the following:
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| 209 | - Increase the EditCounter in sector 55 by one
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| 210 | - Set the CheckSumConfig to 0
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| 211 | - Calculate a new CheckSum by using the algo specified earlier
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| 212 | - Set CheckSumConfig to the checksum you calculated
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| 213 |
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| 214 | In this section, I will specify the basic configuration structure used
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| 215 | in sector 55.
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| 216 |
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| 217 | -----------------------------------------------------------------------
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| 218 | Contents: AiR-BOOT basic configuration structure
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| 219 | =======================================================================
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| 220 | Identifier : STRING * 13 - 'AiRCFG-TABLE'
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| 221 | MajorVersion : BYTE - in BCD
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| 222 | MinorVersion : BYTE - in BCD
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| 223 | ReleaseLanguage : BYTE - normally 'E' for English
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| 224 | EditCounter : DWORD - Will be increased on every save
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| 225 | CheckSumOfConfig : WORD - explained in [2.3]
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| 226 | Partitions : BYTE - Partitions count in IPT
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| 227 | BootPartitions : BYTE - Removed since v0.28b
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| 228 | DefaultSelection : BYTE - Default-selection no (zero based)
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| 229 | FFh - nothing bootable
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| 230 | [additions/changes v1.02+]
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| 231 | FFh - Floppy Boot
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| 232 | FEh - BIOS continue (CD-ROM,etc.)
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| 233 | 80h - nothing bootable
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| 234 | LastPartition : BYTE - Last-booted-partition (zero based)
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| 235 | Even under v1.02+, this never
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| 236 | contains floppy or Resume-BIOS
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| 237 | TimedBoot : BYTE - 0 - Timed Boot disabled
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| 238 | 1 - Timed Boot enabled
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| 239 | TimedSeconds : BYTE - How many seconds till Timed Boot
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| 240 | TimedDelay : WORD - Internal Do not change
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| 241 | TimedBootLast : BYTE - 0 - Boot default, if Timed Boot
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| 242 | 1 - Boot last, if Timed Boot
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| 243 | RememberBoot : BYTE - 0 - No action
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| 244 | 1 - User-Boot->set LastPartition
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| 245 | RememberTimed : BYTE - 0 - No action
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| 246 | 1 - Timed-Boot->set LastPartition
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| 247 | IncludeFloppy : BYTE - 0 - No floppy drive in bootmenu
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| 248 | 1 - Floppy drive in bootmenu
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| 249 | BootMenuActive : BYTE - 0 - Don't display bootmenu
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| 250 | 1 - Display bootmenu
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| 251 | 2 - Detailed bootmenu (v0.91+)
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| 252 | PartitionsDetect : BYTE - 0 - No action
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| 253 | 1 - Add new partitions as bootable
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| 254 | PasswordedSetup : BYTE - 0 - No action
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| 255 | 1 - Ask Password on enter setup
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| 256 | PasswordedSystem : BYTE - 0 - No action
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| 257 | 1 - Ask Password everytime
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| 258 | PasswordedChngBoot : BYTE - 0 - No action
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| 259 | 1 - Ask Password, if user boots
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| 260 | by himself
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| 261 | ProtectMBRTSR : BYTE - 0 - No action
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| 262 | 1 - Install MBR-Protect TSR
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| 263 | ProtectMBRignore : BYTE - 0 - System halt on MBR write
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| 264 | 1 - Ignoring MBR writes
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| 265 | FloppyGetName : BYTE - 0 - No action
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| 266 | 1 - Get floppy name on startup
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| 267 | DetectVirus : BYTE - 0 - No action
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| 268 | 1 - Detect normal MBR virii
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| 269 | DetectStealth : BYTE - 0 - No action
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| 270 | 1 - Detect stealth MBR virii
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| 271 | DetectVIBR : BYTE - 0 - No action
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| 272 | 1 - Detect Virii-In-Boot-Record
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| 273 | AutoEnterSetup : BYTE - 0 - No action
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| 274 | 1 - enter setup automatically
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| 275 | (reset by setup)
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| 276 | MasterPassword : QWORD - Not documented
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| 277 | BootPassword : QWORD - Not documented
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| 278 | RudeProtection : BYTE - Removed since v0.28b
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| 279 | LinuxPartition : BYTE - Linux Root partition no (0-based)
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| 280 | [not used anymore since 1.02+]
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| 281 | TimedKeyHandling : BYTE - 0 - Do nothing
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| 282 | 1 - Reset time
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| 283 | 2 - Stop time
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| 284 | MakeSound : BYTE - 0 - No action
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| 285 | 1 - Make startup/boot sounds
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| 286 | FloppyGetTimer : BYTE - 0 - No action
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| 287 | 1 - Get floppy name every 2 secs
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| 288 | ResumeBIOSbootSeq : BYTE - 0 - Disabled
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| 289 | 1 - CD-ROM
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| 290 | 2 - Network
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| 291 | 3 - ZIP/LS120
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| 292 | CooperBars : BYTE - 0 - Disabled
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| 293 | 1 - Enabled
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| 294 | [following contents are not used anymore - since 1.02]
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| 295 | LinuxCommandLine : STRING * 75 - Linux Command Line (0-terminated)
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| 296 | LinuxKrnlPartition : BYTE - 0FFh - Disabled
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| 297 | Otherwise no of partition
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| 298 | (has to be FAT-16) (0 based)
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| 299 | LinuxDefaultKernel : STRING * 11 - Default Kernel Name
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| 300 | will override Default Partition,
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| 301 | if found. Filled up with spaces.
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| 302 | LinuxKernelNameEnd : BYTE - Fixed ZERO
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| 303 | LinuxLastKernel : STRING * 11 - Last-Booted Kernel Name
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| 304 | if Partition got booted, this
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| 305 | field will get filled with spaces
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| 306 | LinuxKernelNameEnd2: BYTE - Fixed ZERO
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| 307 | [End of contents that are not used anymore]
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| 308 | ExtPartitionMShack : BYTE - 0 - Disabled
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| 309 | 1 - MS Work-Around Enabled
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| 310 | AutomaticBoot : BYTE - Automatic Booting (0.94+)
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| 311 | 0 - Disabled
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| 312 | 1 - Enabled (only for one time)
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| 313 | AutomaticPartition : BYTE - Automatic Booting (0.94+)
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| 314 | Partition no (zero based)
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| 315 | FFh - Floppy booting
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| 316 | FEh - BIOS continue (CD-ROM,ZIP)
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| 317 | ForceLBAUsage : BYTE - Forces BIOS LBA API Usage (1.00+)
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| 318 | 0 - Disabled
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| 319 | 1 - Enabled
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| 320 | IgnoreLVM : BYTE - Ignores LVM information (1.02+)
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| 321 | 0 - Disabled (do not ignore)
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| 322 | 1 - Enabled
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| 323 | Reserved : STRING * 253 - RESERVED
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| 324 | AutoDriveLetter : STRING * 5 - RESERVED CONTENT (0.94+)
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| 325 | (used by Installer/2)
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| 326 | BIOScontIPTentry : STRING * 34 - RESERVED CONTENT
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| 327 | VirusDetectionHelp : STRING * 12 - RESERVED CONTENT
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| 328 | FloppyIPTentry : STRING * 34 - RESERVED CONTENT
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| 329 | -----------------------------------------------------------------------
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| 330 |
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| 331 | Please note:
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| 332 | = Any area marked as Reserved MUST not get touched in any way =
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| 333 |
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| 334 |
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| 335 | ===================================
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| 336 | | 3.2 - INTERNAL PARTITION TABLE |
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| 337 | ===================================
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| 338 |
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| 339 | The internal partition table (IPT) is in sectors 56-57.
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| 340 |
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| 341 | The basic rule: Don't delete/add/move any of those entries.
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| 342 | AiR-BOOT will detect changes on the partition tables
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| 343 | by itself and will adjust pointers from basic
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| 344 | configuration and hide-configuration automatically.
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| 345 |
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| 346 | Each IPT-entry is 34-bytes long. Those entries begin at offset 0.
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| 347 | You have to look in basic configuration to know how many IPT-entries
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| 348 | are in there.
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| 349 |
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| 350 | If you change any partitions-bootable flag, you have to adjust the
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| 351 | BootPartitions-variable from basic configuration accordingly.
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| 352 |
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| 353 | -----------------------------------------------------------------------
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| 354 | Contents: AiR-BOOT internal partition table entry (IPT)
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| 355 | =======================================================================
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| 356 | SerialNumber : DWORD - Serial number of partition /
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| 357 | Partition ID from LVM
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| 358 | (if available)
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| 359 | PartitionName : STRING * 11 - Name of the partition (in sync
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| 360 | with LVM and/or boot-record)
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|---|
| 361 | Drive : BYTE - Drive of partition (INT 13h-like)
|
|---|
| 362 | PartitionID : BYTE - unhidden ID of partition
|
|---|
| 363 | (08h == NTFS, thanx M$)
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|---|
| 364 | (FCh == JFS - v1.05+)
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| 365 | Flags : BYTE - Bit 0 - BootAble
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| 366 | Bit 1 - VIBR Detection
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| 367 | Bit 2 - Hide Feature used
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|---|
| 368 | Bit 3 - Logical Drive Letter set
|
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| 369 | Bit 4 - M$ Partition Hack Req.
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|---|
| 370 | All others: RESERVED
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| 371 | CheckSum : WORD - CheckSum of boot-record
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| 372 | LocationBegin : STRING * 3 - Cyl/Head/Sec of Boot-Record
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| 373 | LocationPartTab : STRING * 3 - Cyl/Head/Sec of Partition Table
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|---|
| 374 | containing this partition
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| 375 | AbsoluteBegin : DWORD - LBA sector of Boot-Record
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|---|
| 376 | AbsolutePartTab : DWORD - LBA sector of Partition Table
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|---|
| 377 | -----------------------------------------------------------------------
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| 378 |
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|---|
| 379 | You may change:
|
|---|
| 380 | SerialNumber/PartitionName - If you sync your changes with the
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| 381 | bootrecord of the partition
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|---|
| 382 | Flags - Do not (re)set any reserved bits
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|---|
| 383 |
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|---|
| 384 | All other entries should NOT be changed by anyone but AiR-BOOT.
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|---|
| 385 |
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|---|
| 386 |
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|---|
| 387 | =============================
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|---|
| 388 | | 3.3 - HIDE CONFIGURATION |
|
|---|
| 389 | =============================
|
|---|
| 390 |
|
|---|
| 391 | First of all, if you define a Hide-Configuration, set the "Hide-Feature
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| 392 | used" flag. If you delete a Hide-Configuration completely, reset the
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| 393 | flag.
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|---|
| 394 |
|
|---|
| 395 | Hiding is defined per partition using a 30-byte string. This string is
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| 396 | built up of Partition-pointers that consist of a single byte.
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| 397 |
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| 398 | Each partition-pointer is actually the number of the partition in the
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| 399 | IPT, which means they are zero-based.
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| 400 |
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| 401 | The entry FFh is a terminator and actually defines "no-partition".
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| 402 | An empty Hide-Configuration entry consists of 30x FFh bytes.
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| 403 |
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| 404 | The partitions listed in each hide-configuration string should be in-
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| 405 | order, which means if you want to hide partition 0, 2 and 3 the string
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| 406 | should look like this: 00h 02h 03h FFh (and 26 more FFhs)
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| 407 |
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| 408 | The boot-drive-letters string is 30-bytes long. One byte per partition.
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| 409 | It's used for OS/2 / eCS use ONLY and it's only definable for HPFS and
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| 410 | FAT16 partitions. If you enable/disable the driveletter, then YOU are
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| 411 | required to change the corresponding partition's Drive-Letter flag
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| 412 | accordingly.
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| 413 |
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| 414 | Since 1.02, AiR-BOOT supports LVM driveletter adjustment and will
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| 415 | change the driveletter of the partition that is to be booted.
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| 416 |
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| 417 | -----------------------------------------------------------------------
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| 418 | Contents: AiR-BOOT hide configuration
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| 419 | =======================================================================
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| 420 | HideConfiguration : STRING * 30 - for one partition each
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| 421 | * 30 -> 900 Bytes (due maximum of 30 partitions in IPT)
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| 422 | DriveLetters : STRING * 30 - Boot driveletters of partitions
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| 423 | [since v0.92+]
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| 424 | 00h - disabled
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| 425 | 80h - "C"
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|---|
| 426 | 81h - "D"...
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|---|
| 427 | Reserved : STRING * 84 - RESERVED
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| 428 | Identifier : STRING * 10 - 'AiRBOOTHID'
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| 429 | -----------------------------------------------------------------------
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